SN74LVC244APWR - Octal Buffer 3-State 24mA | TI | Bus Driver
MPN: SN74LVC244APWR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.52 | $0.52 |
| 10 | $0.47 | $4.70 |
| 100 | $0.38 | $38.00 |
| 500 | $0.31 | $155.00 |
| 1,000 | $0.26 | $260.00 |
Drop-in alternatives for SN74LVC244APWR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
SN74LVC244AQPWRQ1
β Drop-Inπ Reference alternative (not in catalog)
SN74LVC244APWRG4
β Drop-Inπ Reference alternative (not in catalog)
SN74LVC240APWR
β Drop-Inπ Reference alternative (not in catalog)
74LVC244APW,118
β Drop-Inπ Reference alternative (not in catalog)
MC74LCX244DT
β Drop-Inπ Reference alternative (not in catalog)
SN74LVC244APWR Maximum Ratings & Electrical Characteristics
| Function | Octal buffer/line driver, non-inverting |
| Number of Channels | 8 (2 x 4-bit elements) |
| Output Type | 3-State |
| Supply Voltage Range | 1.65 V to 3.6 V |
| Input Voltage Tolerance | 5.5 V |
| Output Drive Current | +/-24 mA at 3.3 V |
| Propagation Delay | 4.3 ns typical at 3.3 V |
| Output Enable | 2 pins (1OE, 2OE), active-low |
| Ioff Partial Power-Down | Yes |
| Latch-Up Performance | >100 mA per JESD 78 Class II |
| ESD Protection HBM | 2000 V (JESD 22 A114-A) |
| ESD Protection CDM | 1000 V |
| Operating Temperature | -40C to +125C |
| Package | TSSOP (PW), 20 pins |
| Mounting Type | Surface Mount |
| Technology | CMOS (LVC family) |
SN74LVC244APWR Pin Configuration
| Pin 1 | 1OE β Output enable 1 (active low) |
| Pin 2 | 1A1 β Input A1, buffer 1 |
| Pin 3 | 2Y1 β Output Y1, buffer 2 |
| Pin 4 | 1A2 β Input A2, buffer 1 |
| Pin 5 | 2Y2 β Output Y2, buffer 2 |
| Pin 6 | 1A3 β Input A3, buffer 1 |
| Pin 7 | 2Y3 β Output Y3, buffer 2 |
| Pin 8 | 1A4 β Input A4, buffer 1 |
| Pin 9 | 2Y4 β Output Y4, buffer 2 |
| Pin 10 | GND β Ground |
| Pin 11 | 2A4 β Input A4, buffer 2 |
| Pin 12 | 1Y4 β Output Y4, buffer 1 |
| Pin 13 | 2A3 β Input A3, buffer 2 |
| Pin 14 | 1Y3 β Output Y3, buffer 1 |
| Pin 15 | 2A2 β Input A2, buffer 2 |
| Pin 16 | 1Y2 β Output Y2, buffer 1 |
| Pin 17 | 2A1 β Input A1, buffer 2 |
| Pin 18 | 1Y1 β Output Y1, buffer 1 |
| Pin 19 | 2OE β Output enable 2 (active low) |
| Pin 20 | VCC β Power supply, 1.65 V to 3.6 V |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
SN74LVC244APWR is suitable for 6 applications: Memory Address Buffering, Clock and Control Signal Distribution, Level Shifting Between 1.8V and 3.3V Domains, General-Purpose I/O Expansion, Data Acquisition Bus Interface, Telecommunications and Networking Line Cards.
Memory Address Buffering
The SN74LVC244APWR drives memory address and control lines where the MCU or FPGA cannot supply sufficient fan-out. With +/-24 mA output drive at 3.3 V and a 4.3 ns typical propagation delay, it buffers address buses to DRAM, SRAM, or flash without adding meaningful setup-time margin loss. The two independently enabled 4-bit sections let designers partition upper and lower address bytes. The 3-state outputs release the bus during memory access by other masters, avoiding contention in shared-bus architectures.
Recommended
Clock and Control Signal Distribution
Clock lines benefit from the SN74LVC244A's symmetric drive and fast edges: at 3.3 V the +/-24 mA output stage maintains rise/fall times into heavily loaded traces, while the 4.3 ns delay is stable across temperature (-40C to +125C), simplifying skew budgets. Used to fan a single clock to multiple peripherals or to strengthen a weak MCU GPIO clock output, the buffer isolates the source from capacitive load. Keep traces length-matched and terminated to preserve duty cycle at high frequencies.
Recommended
Level Shifting Between 1.8V and 3.3V Domains
Powered at 1.8 V, the SN74LVC244APWR accepts 5.5-V-tolerant inputs and drives 1.8-V logic; powered at 3.3 V it bridges 1.8-V sources into 3.3-V systems, since VIH thresholds of the LVC family support 1.8-V-level inputs at 3.3-V VCC. This makes it a cost-effective unidirectional level translator between MCU banks, sensors, and peripherals operating at different rails. The Ioff partial-power-down feature prevents backfeed when one domain is unpowered, protecting multi-rail designs during sequencing.
Recommended
General-Purpose I/O Expansion
Microcontroller and FPGA GPIO banks frequently need extra drive strength or isolation; the SN74LVC244APWR adds eight buffered channels per package. The +/-24 mA drive supports direct LED indication, relay-driver inputs, and optocoupler LED drive at 3.3 V. Independent 1OE/2OE enables let firmware tri-state groups of outputs during reconfiguration or bootloading. In industrial I/O modules, the buffer separates field-facing circuitry from the controller die, improving robustness against transient line stress while preserving logic polarity.
Recommended
Data Acquisition Bus Interface
In data acquisition systems, ADC and DSP buses are shared among converters, memory, and processors. The SN74LVC244APWR's 3-state outputs let it connect or disconnect buffered data lines under control of 1OE/2OE, enabling multi-master bus arbitration. Its 4.3 ns propagation delay preserves conversion timing, and JESD 78 latch-up immunity plus 2000-V HBM ESD protection increase board-level reliability in electrically noisy measurement environments typical of industrial instrumentation and test equipment.
Recommended
Telecommunications and Networking Line Cards
Line cards and network interface boards use the SN74LVC244APWR to buffer status, interrupt, and control signals between framer/PHY devices and backplane logic. The 1.65-3.6 V range matches modern 2.5-V and 3.3-V PHY rails, and the active-low OE pins support hot-swap style bus isolation during card insertion when combined with power-sequencing control. Low static CMOS power keeps idle-card consumption minimal, an important metric in high-density telecom shelves with strict thermal budgets.
Recommended
Recommended Products Summary
Engineering reference data for SN74LVC244APWR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN74LVC244AQPWRQ1 | 74LVC244APW,118 | MC74LCX244DT | SN74LVC240APWR |
|---|---|---|---|---|---|
| Package | TSSOP-20 (PW) | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same | TSSOP-20 - same | TSSOP-20 (PW) - same |
| Brand | Texas Instruments | Texas Instruments | Nexperia | onsemi | Texas Instruments |
| Function | Non-inverting octal buffer | Non-inverting octal buffer | Non-inverting octal buffer | Non-inverting octal buffer | Inverting octal buffer |
| Supply Voltage Range | 1.65 V to 3.6 V | 1.65 V to 3.6 V | 1.65 V to 3.6 V | 1.65 V to 3.6 V [DATA_NEEDED exact] | 1.65 V to 3.6 V |
| Output Drive | +/-24 mA at 3.3 V | +/-24 mA at 3.3 V | +/-24 mA at 3.0 V [DATA_NEEDED exact] | +/-24 mA at 3.0 V [DATA_NEEDED exact] | +/-24 mA at 3.3 V |
| Automotive Grade | No | Yes (AEC-Q100) | No | No | No |
| Input 5.5V Tolerance | Yes | Yes | Yes | Yes | Yes |
| Price (1 pc, as of 2026-08-29) | ~$0.52 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Automotive variant shares identical footprint (vs SN74LVC244AQPWRQ1)
- Preserves logic polarity (vs SN74LVC240APWR)
- Ioff partial-power-down (vs MC74LCX244DT)
Design Notes
Place a 0.1-uF ceramic decoupling capacitor within 2 mm of the VCC pin (pin 20) with a short return path to GND (pin 10). When all eight outputs switch simultaneously into 50-100 pF loads, di/dt transients can cause ground bounce; a solid ground plane under the TSSOP-20 footprint reduces loop inductance. Follow TI CMOS logic application guidelines for bus-buffer layout.
Never leave 1OE or 2OE floating - undefined OE states cause outputs to enter indeterminate levels and raise ICC. Tie unused OE to GND (enabled) or use a pull-up/pull-down resistor on driven OEs. Also remember outputs clamp at VCC: they cannot drive a 5-V input requiring VIH > 3.6 V despite the 5.5-V input tolerance on the A pins.
For bus lengths exceeding roughly 10 ns of propagation (about 2 m of FR-4 trace), consider series termination (22-33 ohm) at the buffer outputs to control reflections. The LVC family's fast edges can overshoot on unterminated stubs; TI's logic application notes recommend keeping stub lengths under one-third of the rise-time equivalent length.
Compliance Information
Suffix PWR (non-G4) denotes RoHS-compliant, lead-free TI standard logic packaging per TI product page. REACH and halogen status not stated in provided data.
